x86, UV: Remove cpumask_t from the stack

Remove the large stack-resident cpumask_t from
reset_with_ipi()'s stack by allocating one per uvhub.

Due to the limited size of the stack the potentially huge cpumask_t may
cause stack overrun.  We haven't seen it happen yet, but we need to make it
a practice not to push such structures onto the stack.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Link: http://lkml.kernel.org/r/20110621122242.832589130@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/uv/uv_bau.h

@@ -488,6 +488,7 @@ struct bau_control {
 	struct bau_control	*uvhub_master;
 	struct bau_control	*socket_master;
 	struct ptc_stats	*statp;
+	cpumask_t		*cpumask;
 	unsigned long		timeout_interval;
 	unsigned long		set_bau_on_time;
 	atomic_t		active_descriptor_count;

arch/x86/platform/uv/tlb_uv.c

@@ -375,13 +375,13 @@ static void reset_with_ipi(struct pnmask *distribution, struct bau_control *bcp)
 	int pnode;
 	int apnode;
 	int maskbits;
-	cpumask_t mask;
 	int sender = bcp->cpu;
+	cpumask_t *mask = bcp->uvhub_master->cpumask;
 	struct bau_control *smaster = bcp->socket_master;
 	struct reset_args reset_args;
 
 	reset_args.sender = sender;
-	cpus_clear(mask);
+	cpus_clear(*mask);
 	/* find a single cpu for each uvhub in this distribution mask */
 	maskbits = sizeof(struct pnmask) * BITSPERBYTE;
 	/* each bit is a pnode relative to the partition base pnode */
@@ -391,11 +391,11 @@ static void reset_with_ipi(struct pnmask *distribution, struct bau_control *bcp)
 			continue;
 		apnode = pnode + bcp->partition_base_pnode;
 		cpu = pnode_to_first_cpu(apnode, smaster);
-		cpu_set(cpu, mask);
+		cpu_set(cpu, *mask);
 	}
 
 	/* IPI all cpus; preemption is already disabled */
-	smp_call_function_many(&mask, do_reset, (void *)&reset_args, 1);
+	smp_call_function_many(mask, do_reset, (void *)&reset_args, 1);
 	return;
 }
 
@@ -1695,6 +1695,16 @@ static void make_per_cpu_thp(struct bau_control *smaster)
 	}
 }
 
+/*
+ * Each uvhub is to get a local cpumask.
+ */
+static void make_per_hub_cpumask(struct bau_control *hmaster)
+{
+	int sz = sizeof(cpumask_t);
+
+	hmaster->cpumask = kzalloc_node(sz, GFP_KERNEL, hmaster->osnode);
+}
+
 /*
  * Initialize all the per_cpu information for the cpu's on a given socket,
  * given what has been gathered into the socket_desc struct.
@@ -1765,6 +1775,7 @@ static int __init summarize_uvhub_sockets(int nuvhubs,
 			socket++;
 			socket_mask = (socket_mask >> 1);
 		}
+		make_per_hub_cpumask(hmaster);
 	}
 	return 0;
 }